[DDC-2943] Disable slc for pagination queries

docs/en/reference/second-level-cache.rst

@@ -729,3 +729,10 @@ should be used in conjunction with distributed caching system such as memcached,
 
 Caches should be used with care when using a load-balancer if you don't share the cache.
 While using APC or any file based cache update occurred in a specific machine would not reflect to the cache in other machines.
+
+
+Paginator
+~~~~~~~~~
+
+Count queries generated by ``Doctrine\ORM\Tools\Pagination\Paginator`` are not cached by second-level cache.
+Although entities and query result are cached count queries will hit the database every time.

lib/Doctrine/ORM/Tools/Pagination/Paginator.php

@@ -182,12 +182,14 @@ class Paginator implements \Countable, \IteratorAggregate
             $whereInQuery->setHint(WhereInWalker::HINT_PAGINATOR_ID_COUNT, count($ids));
             $whereInQuery->setFirstResult(null)->setMaxResults(null);
             $whereInQuery->setParameter(WhereInWalker::PAGINATOR_ID_ALIAS, $ids);
+            $whereInQuery->setCacheable($this->query->isCacheable());
 
             $result = $whereInQuery->getResult($this->query->getHydrationMode());
         } else {
             $result = $this->cloneQuery($this->query)
                 ->setMaxResults($length)
                 ->setFirstResult($offset)
+                ->setCacheable($this->query->isCacheable())
                 ->getResult($this->query->getHydrationMode())
             ;
         }
@@ -208,6 +210,7 @@ class Paginator implements \Countable, \IteratorAggregate
         $cloneQuery = clone $query;
 
         $cloneQuery->setParameters(clone $query->getParameters());
+        $cloneQuery->setCacheable(false);
 
         foreach ($query->getHints() as $name => $value) {
             $cloneQuery->setHint($name, $value);

tests/Doctrine/Tests/ORM/Functional/Ticket/DDC2943Test.php

@@ -0,0 +1,91 @@
+<?php
+
+namespace Doctrine\Tests\ORM\Functional\Ticket;
+
+use Doctrine\Tests\OrmFunctionalTestCase;
+use Doctrine\Tests\Models\Cache\Country;
+use Doctrine\ORM\Tools\Pagination\Paginator;
+use Doctrine\ORM\Cache;
+
+/**
+ * @group DDC-2943
+ */
+class DDC2943Test extends OrmFunctionalTestCase
+{
+    public function setUp()
+    {
+        $this->enableSecondLevelCache();
+        $this->useModelSet('cache');
+        parent::setUp();
+    }
+
+    private function loadFixtures()
+    {
+        $this->_em->persist(new Country("Brazil"));
+        $this->_em->persist(new Country("Canada"));
+        $this->_em->persist(new Country("Germany"));
+        $this->_em->persist(new Country("France"));
+        $this->_em->flush();
+        $this->_em->clear();
+    }
+
+    public function testIssue()
+    {
+        $this->loadFixtures();
+
+        $region = $this->_em->getCache()->getEntityCacheRegion(Country::CLASSNAME);
+        $dql    = 'SELECT c FROM Doctrine\Tests\Models\Cache\Country c';
+        $query  = $this->_em->createQuery($dql)
+            ->setCacheable(true)
+            ->setFirstResult(0)
+            ->setMaxResults(2);
+
+        $this->assertPaginatorQueryPut(new Paginator(clone $query), $region->getName(), 4, 2);
+
+        $this->_em->clear();
+        $this->secondLevelCacheLogger->clearStats();
+
+        $this->assertPaginatorQueryHit(new Paginator(clone $query), $region->getName(), 4, 2);
+    }
+
+    public function testIssueNonFetchJoin()
+    {
+        $this->loadFixtures();
+
+        $region = $this->_em->getCache()->getEntityCacheRegion(Country::CLASSNAME);
+        $dql    = 'SELECT c FROM Doctrine\Tests\Models\Cache\Country c';
+        $query  = $this->_em->createQuery($dql)
+            ->setCacheable(true)
+            ->setFirstResult(0)
+            ->setMaxResults(2);
+
+        $this->assertPaginatorQueryPut(new Paginator(clone $query, false), $region->getName(), 4, 2);
+
+        $this->_em->clear();
+        $this->secondLevelCacheLogger->clearStats();
+
+        $this->assertPaginatorQueryHit(new Paginator(clone $query, false), $region->getName(), 4, 2);
+    }
+
+    public function assertPaginatorQueryPut(Paginator $paginator, $regionName, $count, $pageSize)
+    {
+        $this->assertCount($count, $paginator);
+        $this->assertCount($pageSize, $paginator->getIterator());
+
+        $this->assertEquals(0, $this->secondLevelCacheLogger->getRegionHitCount(Cache::DEFAULT_QUERY_REGION_NAME));
+        $this->assertEquals(1, $this->secondLevelCacheLogger->getRegionPutCount(Cache::DEFAULT_QUERY_REGION_NAME));
+        $this->assertEquals(0, $this->secondLevelCacheLogger->getRegionHitCount($regionName));
+        $this->assertEquals($count, $this->secondLevelCacheLogger->getRegionPutCount($regionName));
+    }
+
+    public function assertPaginatorQueryHit(Paginator $paginator, $regionName, $count, $pageSize)
+    {
+        $this->assertCount($count, $paginator);
+        $this->assertCount($pageSize, $paginator->getIterator());
+
+        $this->assertEquals(1, $this->secondLevelCacheLogger->getRegionHitCount(Cache::DEFAULT_QUERY_REGION_NAME));
+        $this->assertEquals(0, $this->secondLevelCacheLogger->getRegionPutCount(Cache::DEFAULT_QUERY_REGION_NAME));
+        $this->assertEquals($pageSize, $this->secondLevelCacheLogger->getRegionHitCount($regionName));
+        $this->assertEquals(0, $this->secondLevelCacheLogger->getRegionPutCount($regionName));
+    }
+}